Development of Novel Test Specimens for Characterization of Multi-Material Parts Manufactured by Material Extrusion

Multi-material additive manufacturing (AM) offers new design opportunities for functional integration and opens new possibilities in innovative part design, for example, regarding the integration of damping or conductive structures. However, there are no standardized test methods, and thus test specimens that provide information about the bonding quality of two materials printed together. As a result, a consideration of these new design potentials in conceptual design is hardly possible. As material extrusion (ME) allows easily combination of multiple polymeric materials in one part, it is chosen as an AM technique for this contribution. Based on a literature review of commonly used standards for polymer testing, novel test specimens are developed for the characterization of the bonding quality of two ME standard materials printed together. The proposed specimen geometries are manufactured without a variation of process parameters. The load types investigated in the course of this study were selected as examples and are tensile, lap-shear, and compression-shear. The conducted tests show that the proposed test specimens enable a quantification of the bonding quality in the material transition. Moreover, by analyzing the fracture pattern of the interface zone, influencing factors that probably affect the interface strength are identified, which can be further used for its optimization.

[1]  K. Leong,et al.  Investigation of the mechanical properties and porosity relationships in fused deposition modelling‐fabricated porous structures , 2006 .

[2]  Tim A. Osswald,et al.  Plastics Testing and Characterization: Industrial Applications , 2008 .

[3]  Mechanical analysis of lightweight constructions manufactured with fused deposition modeling , 2014 .

[4]  F. Knoop,et al.  Mechanical and Thermal Properties of Fdm Parts Manufactured with Polyamide 12 , 2015 .

[5]  H. Cajner,et al.  Parametric optimization of intra‐ and inter‐layer strengths in parts produced by extrusion‐based additive manufacturing of poly(lactic acid) , 2017 .

[6]  V. Schöppner,et al.  FDM Part Quality Manufactured with Ultem * 9085 , 2011 .

[7]  Ali P. Gordon,et al.  Mechanical Property Optimization of FDM PLA in Shear with Multiple Objectives , 2015, JOM.

[8]  T. Heijmansa,et al.  3D printing of CNT- and graphene-based conductive polymer nanocomposites by fused deposition modeling , 2017 .

[9]  P. Wright,et al.  Anisotropic material properties of fused deposition modeling ABS , 2002 .

[10]  Peter Ifju,et al.  Experimental characterization of the mechanical properties of 3D-printed ABS and polycarbonate parts , 2017 .

[11]  G. Rizvi,et al.  Effect of processing conditions on the bonding quality of FDM polymer filaments , 2008 .

[12]  Alessandra Puglisi,et al.  Additive Manufacturing Technologies: 3D Printing in Organic Synthesis , 2018 .

[13]  Anoop Kumar Sood,et al.  Experimental investigation and empirical modelling of FDM process for compressive strength improvement , 2012 .

[14]  D. Gardner,et al.  Contribution of printing parameters to the interfacial strength of polylactic acid (PLA) in material extrusion additive manufacturing , 2018 .

[15]  Constance W. Ziemian,et al.  Anisotropic Mechanical Properties of ABS Parts Fabricated by Fused Deposition Modelling , 2012 .

[16]  G. Pinter,et al.  Fracture mechanical characterization and lifetime estimation of near-homogeneous components produced by fused filament fabrication , 2018 .

[17]  Ji Zhao,et al.  Influence of Layer Thickness and Raster Angle on the Mechanical Properties of 3D-Printed PEEK and a Comparative Mechanical Study between PEEK and ABS , 2015, Materials.

[18]  B. Fox,et al.  Adhesion of polymers. , 2009 .

[19]  Brian Mellor,et al.  Multiple material additive manufacturing – Part 1: a review , 2013 .

[20]  Seung Ki Moon,et al.  A multi-material part design framework in additive manufacturing , 2018 .

[21]  Ali P. Gordon,et al.  An approach for mechanical property optimization of fused deposition modeling with polylactic acid via design of experiments , 2016 .

[22]  Ismail Durgun,et al.  Experimental investigation of FDM process for improvement of mechanical properties and production cost , 2014 .

[23]  A. K. Sood,et al.  Parametric appraisal of mechanical property of fused deposition modelling processed parts , 2010 .

[24]  Joshua M. Pearce,et al.  The effects of PLA color on material properties of 3-D printed components , 2015 .

[25]  E. García-Plaza,et al.  Additive manufacturing of PLA structures using fused deposition modelling: Effect of process parameters on mechanical properties and their optimal selection , 2017 .

[26]  Yuan Hu,et al.  Mechanical property parametric appraisal of fused deposition modeling parts based on the gray Taguchi method , 2017 .

[27]  Fernandez-VicenteMiguel,et al.  Effect of Infill Parameters on Tensile Mechanical Behavior in Desktop 3D Printing , 2016 .

[28]  A. F. Silva,et al.  Fused deposition modeling with polypropylene , 2015 .

[29]  Caroline Sunyong Lee,et al.  Measurement of anisotropic compressive strength of rapid prototyping parts , 2007 .